inconceivable

1 of 2

adjective

in·​con·​ceiv·​able ˌin-kən-ˈsē-və-bəl How to pronounce inconceivable (audio)
Synonyms of inconceivable
: not conceivable: such as
a
: unbelievable
It's inconceivable they survived the crash.
b
: impossible to comprehend
… a work of inconceivable difficulty and labour …Mary W. Shelley
inconceivability noun
inconceivableness noun
inconceivably adverb

inconceivability

2 of 2

noun

in·​conceivability ¦in+ How to pronounce inconceivability (audio)
1
: the quality or state of being inconceivable
2
: something inconceivable

Examples of inconceivable in a Sentence

Adjective The fire caused an inconceivable amount of damage. After coming this far, to quit now would be inconceivable.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Adjective
The American players seem eager to embrace what might have seemed inconceivable for a big nation with a relatively shallow pedigree in international soccer. Jim Vertuno, Chicago Tribune, 20 June 2026 This level of dominance is inconceivable. Adam Crafton, New York Times, 16 June 2026 But that now seems inconceivable because three Democrats dropped out. George Skelton, Mercury News, 1 June 2026 But that now seems inconceivable because three Democrats dropped out. Los Angeles Times, 25 May 2026 See All Example Sentences for inconceivable

Word History

First Known Use

Adjective

1624, in the meaning defined above

Time Traveler
The first known use of inconceivable was in 1624

Browse Nearby Words

Cite this Entry

“Inconceivable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/inconceivable. Accessed 27 Jun. 2026.

Kids Definition

inconceivable

adjective
in·​con·​ceiv·​able ˌin-kən-ˈsē-və-bəl How to pronounce inconceivable (audio)
: impossible to imagine or believe
inconceivably adverb

More from Merriam-Webster on inconceivable

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster